A heart attack, even though heart disease is the number one killer among women as well as men. And we learned yesterday that rosie o'donnell had a heart attack. And although she survived, she said she made one mistake that could have cost her her life. Abc's amy robach tells us why. Reporter: Two new tweets today from rosie o'donnell letting the world know she's "feeling good" and tweeting this picture saying she's eating heart healthy. This following her bombshell blog detailing a heart attack she suffered last week. After feeling symptoms o'donnell writes, "maybe this is a heart attack. I googled women's heart attack symptoms I had many of them but really? I thought, na." O'donnell didn't seek medical attention right away. Instead of calling for help, she took an aspirin and waited until the next day to see a cardiologist where she learned her coronary artery was 99% blocked. Ma! I think you're having a heart attack. Do I look like the type of person who has a heart attack? Reporter: This psa pointing out the potentially dangerous implication among women. They don't think it is going to happen to another woman. Reporter:1 in 3 will die of heart disease every year. Believe it or not two, thirds of the women who have heart attacks die suddenly, never making it to the hospital so is this a big problem. Reporter: O'donnell knows she's lucky and wants to make sure other women don't make the same mistake she did. Though the symptoms, ladies. Listen to the voice inside, the one we also easily ignore. Call 911. Save yourself." Amy robach, abc news, new york. Dr. Richard besser is here. What did rosie do, she got the symptoms, why? She recognized the symptoms seen more frequently in women like nausea and sweating and she chewed an aspirin, it gets into your blood quickly. And then she went to bed? She went to bed. Time management when you're having a heart attack, you dial 911. You don't go to bed. You were saying to me, embarrassment keeps so many people from going to the hospital? That's a big one, particularly in women, people are afraid you were going to go to the hospital and doctors are going to say it's just indigestion. There's no doctor, every doctor would rather see 50 people who have indigestion than this one who is really having a heart attack. You have to get over that. That terms of what happened before here, we hear 99% blockage. Does that mean there's some symptoms she missed? Here, you really have to listen to your body. If you're getting short of breath or tired going up the stairs or going for a walk and that's new, you have to go to your doctor. Don't ignore that. Again, don't let embarrassment keep you back.

This transcript has been automatically generated and may not be 100% accurate.

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